You need the below to understand how my wife and I had magic work on Udava.
7 Of the Power
7.1 Nature of the ManaNeth
7.1.1 The ManaHeart
7.1.2 The ManaStreams
7.1.3 The ManaBlood
7.1.3.1 Drinking the ManaBlood
7.1.4 The ManaNodes
7.1.5 The ManaSurges
7.1.6 The ManaStorms
7.1.6.1 Diagram of a ManaStorm
7.1.7 The ManaEruptions
7.1.8 The ManaNeth in Depth
7.2 Nature of the ManaThrek
7.2.1 Conjuction with the ManaNeth
7.2.2 Difference from the ManaNeth
7.3 The Avatars
7.3.1 What They Are
7.3.2 Conjunction with the Power
7.3.3 Their Abilities
7.4 Using the Power
7.4.1 Learning About the Power
7.4.2 Learning How to Use the Power
7.4.3 Learning, Learned, and Known Spells and Spell Lists
7.4.4 The ManaScriptures
7.4.5 Extending the Power
7.4.6 Expanding the Power
7.4.7 Stretching the Power
You do not need the below information if you would rather use the normal Rolemaster races or your own.
8 Of the Peoples and Cultures
8.1 Udava
8.1.1 Eyanoruman
8.2 The Nargthrin Overlord Dominion
8.2.1 The Rorgan Assemblage
8.3 The Dugrayarin
8.3.1 The Vinyarin (Utaruman)
8.3.2 The Farnyarin (Hrelalurn)
8.3.3 The Larëyarin (no one ever met)
8.3.4 The Mithyarin (no one ever met)
8.3.5 The Yelriyarin (Lornugur)
8.3.6 The Nenyarin (no one ever met)
8.3.7 The Arndyarin (Karnöugur)
8.3.8 The Hathyarin (no one ever met)
8.4 The Humans
8.4.1 Common
8.4.1.1 Gortan (Coastal)
8.4.1.2 Lertan (River)
8.4.1.3 Mortan (Forest)
8.4.1.4 Sartan (Swamp)
8.4.1.5 Urtan (Plains)
8.4.1.6 Vortan (Mountains)
8.4.2 Mixed
8.4.2.1 Gorvan (Coastal)
8.4.2.2 Lervan (River)
8.4.2.3 Morvan (Forest)
8.4.2.4 Yarvan (w/ Yogman)
8.4.2.5 Urvan (w/ Tarman)
8.4.2.6 Vorvan (Mountain)
8.4.2 Noble
8.4.3.1 Gorman (Mariners)
8.4.3.2 Lerman (River)
8.4.3.3 Morman (Forest)
8.4.3.4 Tarman (Builders)
8.4.3.5 Vorman (Mountains)
8.4.3.6 Yogman (Islanders)
8.4.4 Great
8.4.4.1 Æmurëirun
8.4.5 Unusual Human
8.4.5.1 Tomofu
8.5 The Unusuals
8.5.1 The Arkaran
8.5.2 The Azerkan
8.5.3 The Dangron
8.5.3.1 The Dinrin
8.5.4 The Dhralorgan
8.5.5 The Ewonin
8.5.6 The Felarin
8.5.7 The Grelnin
8.5.8 The Harinin
8.5.9 The Ishtrinoin
8.5.10 The Kraugn
8.5.11 The Quaranin
8.5.12 The Rakanan
8.5.13 The Surikezn
8.5.14 The Dispersers
8.6 The Gulrarn
8.6.1 The Gulhirn
8.6.2 The Gulhran
8.6.3 The Gulmarn
8.6.4 The Gulgaln
8.7 The Magoth
8.7.1 The Dorgoth
8.7.2 The Grigoth
8.7.3 The Narggoth
8.8 The Dagogs
8.8.1 The Kreegog
8.8.2 The Trogdor
8.8.3 The Margog
8.8.4 The Dispersers
You may use as many of the below as wished. You may also add to them. If you wish to add a locale to the below, email your information to me, and I will seriously consider such.
9 Of the Major Locales
9.1 Yadrevay
9.1.1 Krystos Mountain
9.1.2 Simerjia
9.1.3 The Shangrala Palisade
9.1.4 The Shantelaine Acropoli
9.1.5 The Felari Citadel
9.1.6 The Quarani Citadel
9.1.7 Kragmara Citadel
9.1.8 Ruins of Aranya
9.1.9 Kazâk-dûm
9.1.10 Zûrmôg Citadel
9.1.11 Ruins of Mangara Citadel
9.2 Doramanthyiäl
9.2.1 Aranaldaburg
9.2.2 Fields of Arweno
9.2.3 Tesamer Eärwëlond
9.2.4 Morta Kal Urjon
9.2.5 Enril Mor Uma
9.2.6 The Impassable Mountains
9.2.7 The Vorgdrung and Ostnor
9.3 Bilkaramok
9.3.1 Citadel Harbor of Pariska
9.3.2 Shantelaine Acropoli
9.4 Gwaithlond
9.4.1 The Citadel of the Æmurëirun
9.4.2 Jugardonbad
9.4.3 The Great Northern Caldera
9.4.4 Multra Mines
9.4.5 Jwarkijhor
9.4.6 The Atoll
9.4.7 Urtopis Archipelago
9.5 Eyanoruman
9.5.1 Hrudnkronos
9.6 Off Planet
9.6.1 The Gates of Oblivion
9.6.2 Delbasa
Again, use as many as wished. If you wish to add an Arcane Society to the below, email your information to me, and I will seriously consider such.
10 Of the Arcane Societies
10.1 Shantelaine Fellowship
10.2 Shangrala Sisterhood
10.3 League of the Transposers
10.4 The Elemental Lords
10.5 The Maktemyens of Simerjia
10.6 Guild of the Mesmerizers
10.7 Dream Lords
If you use the Udavan races, then the below information is a must. It details the past as remembered by certain cultures and societies. Not all remember the past the same way.
11 Of the Past Remembered
The below are listed in accordance to the current map of Udava.
11.1 By the Humans of the Kragmara Empire
11.2 By the Mountain Men
11.3 By the River Men
11.4 By the Forest Men
11.5 By the Sartan & Yarvan
11.6 By the Tomofu
11.7 By the Arkara
11.8 By the Azerka
11.9 By the Dangro
11.10 By the Dinri
11.11 By the Ewoni
11.12 By the Felari
11.13 By the Ishtrinoi
11.14 By the Kraug
11.15 By the Quarani
11.16 By the Surikez
11.17 By the Dugrayarin, Dhralorga, Harini, and Dispersers
Again, use as many as wished. If you wish to add any flora to the below, email your information to me, and I will seriously consider such.
12 Of the Unique Flora
12.1 Yadrevay
12.1.1 Whisperleaf
12.1.2 Montusla Fungus
12.1.3 Kra-aala
12.1.4 Althana
12.1.5 Cupasu
12.2 Doramanthyiäl
12.2.1
12.3 Bilkaramok
12.1.1 Montusla Fungus
12.1.2 Kra-aala
12.1.3 Althana
12.1.4 Cupasu
12.4 Gwaithlond
12.4.1 Cistern Fungus
12.5 Eyanoruman
Again, use as many as wished. If you wish to add any fauna to the below, email your information to me, and I will seriously consider such.
13 Of the Unique Fauna
13.1 Yadrevay
13.1.1 Dortog
13.1.2 Kraytarë
13.2 Doramanthyiäl
13.2.1 Dortog
13.2.2 Kraytarë
13.3 Bilkaramok
13.3.1 Dortog
13.3.2 Kraytarë
13.4 Gwaithlond
13.5 Eyanoruman
13.6 From Elsewhere
13.6.1 True Entities
13.6.1.1 The Watchers
13.6.2 Demons
13.6.2.1 The Six Pales
13.6.2.2 The Void
13.6.2.3 Of Hell
13.6.2.4 Lords of Hell
13.6.2.5 Of Oblivion
13.6.2.6 The Beyonders
13.6.2.7 Of the Nether
13.6.3 Gods
13.6.4 Angels
Again, use as many as wished. If you wish to add a power to the below, email your information to me, and I will seriously consider such.
14 Of the Unique Power
14.1 NethMana
14.1.1 Temporal Mastery
14.2 ThrekMana
14.2.1 Spells of the Shangrala Sisterhood
The below is not required unless you want to stick to playing in a purely Udavan setting. As titled, these are only the Major Gods. There are many others, but none compare in magnitude of pure power. It must be remembered that The Watchers do NOT need worshippers to gain power. Their power exists because they exist. Also see, Rankings of Entities.
15 Of the Major Gods of Udava
15.1 The Watchers
15.1.1 The Firnuman
15.1.2 The Deäluman
15.2 The Dark Cousins
15.3 The Lost Gods
15.4 The Bagaërayn
15.4.1 The Firnerayn
15.4.2 The Deälerayn
15.4.3 The Nargerayn
15.4.4 The Vekerayn
15.5 The Komerayn
15.5.1 The Firnkom
15.5.2 The Deälkom
15.6 Other Gods
The below is not required. The Mardona Stellar System can be "plopped" into any other universe rather easily. After all, you are a GM. 
16 Of Revisiting the Cosmos
16.1 Interstellar Earthen Empire
16.1.1 Political Structure
16.1.2 Social Structure
16.1.3 Military Structure
16.1.4 Autonomous Governments
16.1.5 Physiology
16.2 Urgon Hegemony Federation
16.2.1 Political Structure
16.2.2 Social Structure
16.2.3 Military Structure
16.2.4 Autonomous Governments
16.2.5 Physiology
16.3 Inurian Confederacy
16.3.1 Political Structure
16.3.2 Social Structure
16.3.3 Military Structure
16.3.4 Autonomous Governments
16.3.5 Physiology
16.4 Snekra Dynasty
16.4.1 Political Structure
16.4.2 Social Structure
16.4.3 Military Structure
16.4.4 Autonomous Governments
16.4.5 Physiology
16.5 Khryshyn Concordium
16.5.1 Political Structure
16.5.2 Social Structure
16.5.3 Military Structure
16.5.4 Autonomous Governments
16.5.5 Physiology
16.6 Enigman Invaders
16.6.1 Political Structure
16.6.2 Social Structure
16.6.3 Military Structure
16.6.4 Autonomous Governments
16.6.5 Physiology
The below is also a must if you plan on playing in a purely Udavan setting. This details the true history of Udava.
17 Of the True Past of Udava
17.1 Of the History
17.1.1 The True First Peoples
17.1.2 The Vorgdrung
17.1.3 The Rise of the Vinyarin
17.1.4 The Coming of the Nargthrin
17.1.5 The Genetic Experiments
17.1.6 The Great Galactic War
17.1.7 The Coming of the Watchers
17.1.8 The Vramzangondra
17.1.9 The First Age
17.1.10 The Second Age
17.1.11 The Third Age
17.1.12 The Great War of Dominion
17.1.13 The Vorgkreäsa
17.1.14 The Trial of Selthor
17.1.15 The Fourth Age
17.1.16 The Fifth Age
17.2 Of the Timeline
All of the below is just general information. It is not needed unless you really want to use it.
18 Of the Geodynamics
19 Of Special Considerations
19.1 Time Travel
20 Of Udava and D&D
20.1 Pummeling versus Skill
20.2 Class Restrictions versus Profession Based Development